.....Besides, bridging (theoretically)
quadruples power into a given load, assuming the power supply is capable of delivering double amperage to each amp channel.
When you double the voltage accross a given resistance, the current also doubles. Since power is equal to voltage times current (P=ExI), the resultant power would be quadruple, again assuming the necessary current is available.
Years ago, I had built a pair of mono amps, the Universal Tigers, from kits, sold by Southwest Technical Products, and featured in construction articles in Popular Electronics. They were rated at 75W/ch continuous. The power supplies were 80V at 3A.
To be able to double power, each would need 80V at 6 amps. Bridging requires two amps per channel, so I figured I'd have all the power I'd need for four amps with 80V at 24 amps. I built a separate chassis for the power supply using a pair of 40V at 25A transformers with the secondaries in series, a 25A block rectifier, and a total of 90,000 µF filtering caps.
Needless to say, the package was more than capable of powering the speakers I had back then: Rectilinear III's, which were very inefficient and rated to accept 100W continuous.
Larry
www.fineelectricco.com